Growth of embryos within the seed of Heracleum sphondylium proceeds more rapidly at low temperature than at room temperature. At 2° growth is exponential and in 9 weeks the size is increased 4 times and the dry weight 25 times. At 15° there is a progressive falling off in the rate of growth, and growth ceases when both size and dry weight have been only doubled.
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Pearl Stokes (1952) studied this question.